code: def _prepare_dict(self):
      d = {"a": 1, "b": 2, "c": 3}
      mutation_d = capture_container.MutationAwareDict(copy.copy(d))
      return d, mutation_d
  
file_path: tensorflow-upstream/tensorflow/core/function/capture/capture_container_test.py
imports: import copy
  from absl.testing import parameterized
  from tensorflow.core.function import trace_type
  from tensorflow.core.function.capture import capture_container
  from tensorflow.python.platform import test
label_desc: Use image node_id 1 for calling the MutationAwareDictTest obj's underlying member method code with example usage: obj._prepare_dict() and returns: d,  mutation_d